THE GRAPSOID CRABS OF AMERICA. 39 



KEY TO THE SPECIES OK THE GENUS 8PEOCABCINCS. 



A 1 . Antero-lateral teeth 5, including the orbital nngle. Chelipeds nearly smooth. 



carolinensis, p. 39. 



A*. Antero-lateral teeth less than 5. 

 B 1 . Antero-lateral teeth 4. 

 C 1 . Antero-lateral teeth small, separated by slight notches. Lobes of front 



obliquely truncate. Chelae coarsely granulate ffranulimanus. p. 40. 



C*. Antero-lateral teeth of good size and well separated. Lobes of front 



arcuate. Chelae almost smooth ostrcaricola, p. 41. 



B*. Antero-lateral teeth 3. Chelipeds nearly smooth calif oi-nienais, p. 42. 



SPEOCARCINUS CAROLINENSIS Stimpson. 



Plate 8 ; plate 159, fig. 6. 



Spcocarcinus carolinensia STIMPSON, Ann. Lye. Nat. Hist. New York, vol. 7, 

 1859, p. 59, pi. 1, figs. 1-3 (type-locality, Charleston Harbor, S. C.; 

 type not extant). RATHBUN, Bull. U. S. Fish Comm., vol. 20, for 

 1900, pt. 2, 1901, p. 11, test-fig. 2. 



Diagnosis. Eyestalks constricted. Antero-lateral teeth five. 

 Chelipeds nearly smooth. 



Description. Carapace nearly smooth, punctate, obscurely gran- 

 ulate near the margins, pubescent. Gastric region and its subdivi- 

 sions well defined. Antero-lateral margin 5-toothed, including the 

 angle of the orbit; second tooth rounded and not always distinctly 

 separated from the first; last three teeth sharp and moderately 

 prominent. Postero-lateral margins parallel. Front about one- 

 fourth width of carapace, edge nearly straight, a little sinuous, and 

 with a median emargination. Eyestalk constricted next the cornea. 

 Maxilliped with antero-external angle of merus produced outwardly. 



Chelipeds robust, nearly smooth, margins hairy. A strong, sharp 

 spine or tooth near summit of merus. Inner margin of carpus 

 granulated, with a blunt tooth at inner angle. Outer surface of 

 hand glabrous, microscopically granulated. Dactylus of larger chela 

 with a stout tooth at base. Legs with hairy margins. 



Measurements. Male, Charleston, length of carapace 23.2, width 

 of same 28.5 mm. 



Habits. " This crab lives in the subterranean galleries excavated 

 in the mud at low-water mark by the Squilla, Callianassa, and 

 other Crustacea, or by large worms." (Stimpson.) 



Range. South Carolina to the West Indies. To a depth of 76 

 fathoms. 



Material examined. 



Charleston Harbor, South Carolina (M. C. Z.). 



